# US 4,394,273 A · Defoamers for aqueous liquids containing soluble zinc salts

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- Number: US 4,394,273 A
- Document ID: US4394273A
- Status: Granted
- Kind: A
- Application number: 06/329,350
- Filed: 1981-12-10
- Granted: 1983-07-19
- Earliest claimed: 1981-12-10
- Assignees: NL Industries, Inc.
- Inventors: Michael H. Hoff
- Web page: https://patentgrep.com/patent/US4394273A

## CPC

- C09K 8/06: Clay-free compositions (containing inorganic compounds only C09K8/05)
- B01D 19/04: by addition of chemical substances
- B01D 19/0404: {characterised by the nature of the chemical substance}
- Y10S 507/925: Completion or workover fluid
- Y10S 507/926: Packer fluid
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

2,6,8-Trimethyl-4-nonanone and the triethoxylated derivative of 2,6,8-Trimethyl-4-nonanol synergistically combine to reduce the foaming of heavy brines containing zinc bromide and one or more soluble salts from the group calcium chloride and calcium bromide.

## Claims

### Claim 1

A defoaming composition comprising a mixture of 2,6,8-trimethyl-4-nonanone and the triethoxylated derivative of 2,6,8-trimethyl-4-nonanol wherein the volume ratio of 2,6,8-trimethyl-4-nonanone to the triethoxylated derivative of 2,6,8-trimethyl-4-nonanol is in the range from about 9:1 to about 1:9.

### Claim 2 (depends on 1)

The composition of claim 1 wherein said volume ratio is in the range from about 7:1 to about 1:7.

### Claim 3 (depends on 1)

The composition of claim 1 wherein said volume ratio is in the range from about 5:1 to about 1:5.

### Claim 4 (depends on 1, 2)

A method of decreasing the foam which forms on mixing an aqueous brine containing a soluble zinc salt which comprises mixing with the brine the defoaming composition of claim 1, 2, or 3.

### Claim 5 (depends on 1, 2)

A method of decreasing the foam which forms on mixing an aqueous brine containing zinc bromide which comprises mixing with the brine the defoaming composition of claim 1, 2, or 3 .

### Claim 6 (depends on 1, 2)

A method of decreasing the foam which forms on mixing a heavy brine having a density greater than about 14.2 pounds per gallon containing at least 20% by weight zinc bromide with a composition containing hydroxyethyl cellulose which comprises mixing with the brine the defoaming composition of claim 1, 2, or 3.

### Claim 7 (depends on 1, 2)

A heavy brine well servicing fluid which comprises an aqueous solution having a density greater than about 14.2 pounds per gallon and the defoaming composition of claim 1, 2, or 3.

### Claim 8 (depends on 1, 2)

A heavy brine well servicing fluid which comprises an aqueous solution having a density greater than about 14.2 pounds per gallon, from about 1 to about 5 pounds per 42 gallon barrel of hydroxyethyl cellulose, and from about 0.01 to about 5.0 milliliters per 42 gallon barrel of the defoaming composition of claim 1, 2, or 3.

### Claim 9 (depends on 1, 2)

A heavy brine well servicing fluid which comprises an aqueous solution having a density greater than about 14.2 pounds per gallon, from about 1 to about 5 pounds per 42 gallon barrel of hydroxyethyl cellulose, and from about 0.05 to about 0.5 milliliters per 42 gallon barrel of the defoaming composition of claim 1, 2, or 3.